Expansion anchor and bolt.



THOMAS MASON, OF NEW YORK, N. Y.

EXPANSION ANCHOR AND BOLT.

Specification of Letters Patent.

Application' :tiled June 27, 1908.

Patented .Tune 15., 1909..

Serial No. 440,643.

To all whom it may concern.'

Be it known that l, TnoMAs h' Asca', a citizen of the United States, and resident of the city, county, and State of New York, have invented certain new and useful .improvements in Expansion Anchors and Bolts, of which the following is a specification.

My invention relates to an improvement in expansion anchors and bolts for pipe hangers and the like, the object being to provide a simple and inexpensive device which can be inserted in the ceilings and walls of cement constructed buildings and sustain a heavy load or strain without the danger of breaking away or cracking the cement surrounding it, and which anchors, when once inserted, cannot be removed.

It is found in practice, when any of the conventional expansion bolts or anchors are used in the newly developed construction of cement or concrete buildings, that when the expanding means move forward when the bo t is screwed up, or when chisel-like wings, bearing only at the sharp edges are used as anchors in such buildings, there is a tendency to cracker break away the cement when the rod or screw is subjected to sustain any great weight, such as sprinkler pipes, filled with water. I overcome this serious objection in my improved anchor.

Referring to the accompanyingr drawing', Figure 1 is a horizontal perspective side elevation of the several parts of the anchor proper; Fig. 2 is a horizontal central sectional view, showing positions of the parts assembled, and Fig. 3 is a similar view, showing the anchor expanded.

Similar reference characters indicate like parts in the several views..

The sleeve 'is cylindrical, and is composed of two interengaginv "sections 1, .2, each of which is of like construction and each having itsA periphery provided with a series of concentric ribs`3. Each of the sections of the sleeve is provided at one end with a iup;r and l, a recess whereby the sections can interengage l with each other, so as to'be properly positioncd, the lug is indicated by the reference character 5- and the recess by the reference character 6. ilhe inner face of each section` tapers from a p int removed from each end toward the center as indicated by the reierence characters 7 and 8, by such an arrangienient thc larger diameter is near the center ol' the sleeve, at the outer terminus oi the tapering portion 8, tho inner lace of the section provided with a shoulder 9. Each of the sections is furthermore provided with a longitudinally extending slot l and which is ot' a length equal to the lengtlrof. the taperinpr portion of the inner face olits respective section, the end walls of each slot siv constil tilting shoulders to form abutments for the wings ol' a wedge and a nut to be'presently referred to.

Arranged within the sleeve is an ovalshaprd tapering' wedge 1() provided at its larger end with a pair otdiametrically opposed wings 11, 12, which 4extend into the slots 4. The wedge 1() at its larger end is recessed as at 13 for the reception of the end of an adjusting bolt or rod 18. Arranged within the sleeve is a slightly oval-shaped tapering nut 14 havingr its periphery formed with a pair of wings of a length equal to the length of the nut, the wings are indicated ly the reference characters 15, 16., are diametrically opposed with respect to each other, and extend in the slots 4. AThe wings, 15, 16,

`are of a greater length than the wings 11, 12.v

The nut 14 is threaded as at 17, the said threads being adapted to be engaged by the threads of the adjusting bolt or rod 18. The nut 14 is oppositely disposed with respect to the wedge 10.l

The manner of setting up and usingthe anchor is as follows: An opening being provided oi sufficient depth and suitable diameter in the cement by drilling or otherwise, the anchor is'then assembled, this is had in the following manner, the wedge is inserted in the center of one of the sections of the sleeve, the wings of the wedge entering the slot of said section, the nut is then inserted, the wings of nut also entering the slot in the said section, the other section ci the sleeve is then laid on the first one, the lugs on. the sections engaging in the recesses formed in the sections, theianchor can then be pushed.,

into the opening.` The bolt is screwedinto and throughithe nut, and when the inner end of the bolt touches the recess of the wedge, the latter-'is' pressed upwardly against the inner tapering part oflthe sleeve which is forced outward against the cement;l the ribs on the surface embedding themselves in the niaterial; the wings prevent the turning oi the nut and wedge, and as the screwing in of the bolt continues,. first -one and` then the other end of the sections of'tlie sleeve will expand, this action dependingl upon the rcsistancc of the material and or' the wedge by Letters Fatent is:

and nut; that is to say, if the anchor is fully expanded atthe top so that the resistance of the cement or surrounding material prevents any further expansion at thati end, then the nut will travel downward until further movement ischecked by the resistance of the material at the lower end, and should the nut travel the full distance until it strikes the inner shoulder, then additional pressure can 1o be brought against the winged Wedge by turning the belt until the anchor is firmly seated `or positioned in the supporting material. After once being thus seated, the bolt ma be withdrawn, but the wedge and nut vWil Vre'- main in position and keep the anchor expanded.

The action'of the -two movable parts is such that owing to difference of the two ta# l. f pers in the sleeve, the Agreatest pressure will e exerted at the inner-or cone end where the cement or material is most solid, the `expanding of the anchor being done without any strain on said.' material, and as the outward pressure is made entirely inside of the sleeve oranchor by the inclosed movable parts, there is no vshifting or sliding movement of said sleeve.- i e i What-l claim as new" and desire to secure `An expansible anchor comprising a sleeve formed or two longitudinally extending semi-cylindrical sections interengaging with l each other and ada ted to be shifted away from each other, eac of said sections having its outer face rovided with concentric ribs and its inner ace ta erin from a point removed from each en to t 1e center, each of said sections furthermore rovided `with a longitudinall extending s ot of a length equal to the ength of the tapering portion of 40 the inner face of its vrespective section, the end walls of each of said slots constituting shoulders, an oval-sha ed tapering 4wed e ositioned Within the s eeve and having t 1e argenend thereof provided with a pair of relativel short wings extending in said slots, said we ge further having its enlarged end recessed, an oval-shaped ytapering nut ar ranged within the sleeve and provided with wings of a Alength equal to the length of the nut, said wings extending in said slots, said Wedge and said nuts oppositely disposed with respect to each other, and an adjusting means extending through the nut and enga ing with the wedge. l 5f igned at NewYork city in the county of New York and State ofi New York this eleventh'day of JunecA. -D. 1908.

. THOMAS MASON. Witnesses:

vEDGAR M. GREENBAUM, FRANK A, SEIBERT. 

